The OpenSolaris 2008.11 b101a-rc1b release candidate ISO's have landed.
These contain the bits needed to make the Live CD and installer use
speech and/or magnification. As a result, and as we've heard from Josh
Lambert, it is now possible to install OpenSolaris using Orca. Yeah!
More information can be found at the following links:

Note that there is little we can change for the 2008.11 release, and I
don't expect everyone to have the same success as Josh. With your help
and feedback, however, we can definitely work to improve things for
2009.04. Please download the ISO's and give this a shot and let us know
how it works for you.